Stethantyx neopropodeator Khalaim & Sääksjärvi, 2013

Khalaim, Andrey I., Sääksjärvi, Ilari E. & Bordera, Santiago, 2013, Tersilochinae of Western Amazonia (Hymenoptera: Ichneumonidae). Genus Stethantyx Townes, part 1, Zootaxa 3741 (3), pp. 301-326 : 313-315

Stethantyx neopropodeator Khalaim & Sääksjärvi , sp. nov.

( Figs 25–30 , 56 )

Comparison. This species is similar to S. propodeator Khalaim & Broad and S. trepida sp. nov. in having reddish orange mesosoma with black propodeum, but differs from these two species in having frons and mesoscutum impunctate or with very fine, mostly indistinct punctures (both are distinctly punctate in S. propodeator and S. trepida ), flagellum with 28–30 segments (20–26 segments in S. propodeator and S. trepida ), weaker notaulus, shorter lateral longitudinal carinae of scutellum, narrower basal area of propodeum and longer ovipositor.

Description. Female. Body length 5.4 mm. Fore wing length 3.5 mm.

Head very strongly rounded behind eyes in dorsal view; temple almost 0.4× as long as eye width. Mandible with upper tooth much longer than lower tooth. Clypeus lenticular, weakly convex in lateral view, smooth in lower part, finely punctate on smooth or very finely granulate background in upper part. Malar space about half as long as basal width of mandible. Antennal flagellum distinctly narrowed towards apex, with 28–30 flagellomeres (28 flagellomeres in holotype); subbasal and mid flagellomeres 1.4–1.7×, subapical flagellomeres 1.3–1.5× as long as broad. Face, frons, vertex and temple granulate, dull, impunctate or with very indistinct punctures. Face with weak prominence centrally.

Mesosoma finely granulate; mesoscutum, scutellum and dorsolateral area of propodeum usually with very fine (often indistinct) punctures; mesopleuron finely punctate centrally. Notaulus absent, or as small tubercle or pit distant from anterolateral margin of mesoscutum. Scutellum with lateral longitudinal carinae short, extending from its base to about 0.3–0.4 of length of scutellum. Foveate groove of mesopleuron deep, moderately broad, with strong transverse wrinkles, rather long, strongly upcurved anteriorly, extending more or less from anterior 0.2 to posterior 0.8 of mesopleuron. Transverse carina of propodeum with very short wrinkles adjacent to carina anteriorly. Basal area of propodeum narrow (basal longitudinal carinae subparallel), 2.5–3.0× as long as broad and 0.74× as long as apical area. Propodeal spiracle big, separated from pleural carina by 0.5–0.8× diameter of spiracle. Apical area flat, broad, widely rounded anteriorly.

Fore wing with first and second sections of radius angled about 100°. Intercubitus subequal to abscissa of cubitus between intercubitus and second recurrent vein. Metacarpus reaching apex of fore wing. Hind wing with nervellus slightly reclivous.

Legs slender. Hind femur 4.6× as long as broad, and 0.9× as long as tibia. Hind spurs almost straight.

First tergite slender, 4.3× as long as posteriorly broad, smooth, striate laterally before glymma. Glymma situated behind middle of tergite, moderately large, joining by sharp groove to ventral part of postpetiole. Second tergite 1.9× as long as anteriorly broad. Thyridial depression about 3.0× as long as broad. Ovipositor upcurved, with weak dorsal subapical depression; sheath almost 3.0× as long as first tergite and 2.8× as long as hind tibia.

Head black; clypeus brownish yellow with transverse brownish marks on its upper and lower margins; palpi and mandible (teeth reddish black) yellow. Antenna usually entirely brown, sometimes scape and pedicel pale brown or slightly yellowish. Mesosoma reddish brown, propleuron and anterior margin of pronotum slightly paler, propodeum dark reddish brown to black, always conspicuously darker than rest of mesosoma. Tegula reddish brown. Pterostigma brown. Legs predominantly brownish yellow; hind leg with femur and tibia brown to dark brown, tarsus usually infuscate. Metasoma behind first tergite yellow ventrally to brown dorsally and dorsolaterally, tergites dorsally with yellow band or triangular mark posteriorly.

Male. Unknown.

Material examined. Holotype female (UNSM), Peru, Loreto reg., Iquitos Area, Allpahuayo, clayish soil, 4– 20.X.1998, coll. I.E. Sääksjärvi et al., APHI C2/4.

Paratypes. Peru, Loreto: Iquitos Area, Allpahuayo, clayish soil, coll. I.E. Sääksjärvi et al.: 1 ♀ (ZISP) 3– 22. V.1998, 3 ♀ (2 ♀ UNSM, 1 ♀ ZISP) 22.V–11. VI.2000, 1 ♀ (UNSM) 18.VIII–14. IX.2000, 1 ♀ (ZMUT) 15.X– 8.XI.2000. Same data, but white sand: 1 ♀ (ZMUT) 11–29. VI.2000, 2 ♀ (ZMUT, BMNH) 28.XII.2000 – 23.I.2001. 1 ♀ (ZMUT) same locality, 30º57′78′′ S, 73º25′39′′ W, 24–30.X.2011, coll. I. Gómez & I.E. Sääksjärvi. 1 ♀ (CEUA) Iquitos Area, Mishana, clayish soil, 1–16.XI.1998, coll. I.E. Sääksjärvi et al.

Distribution. Peru (Loreto).

Etymology. Named from the Latin neo - (new) and propodeator (name of the similar species, Stethantyx propodeator Khalaim & Broad ).

Figures

FIGURES 25 – 30. Stethantyx neopropodeator sp. nov., ♀, holotype (25, 27, 29, 30) and paratype (26, 28): 25 — head with antennae, lateral; 26 — head and anterior part of mesoscutum, dorsal; 27 — head, frontal; 28 — mesosoma, lateral; 29 — propodeum, dorsolateral; 30 — metasomal segments 2 and 3, dorsal.

FIGURES 56 – 59. Stethantyx spp., ♀, holotypes, habitus: 56 — S. neopropodeator sp. nov.; 57 — S. orellana sp. nov.; 58 — S. sinuata sp. nov.; 59 — S. tiputinia sp. nov. Scales 1.0 mm.